Chapter 9 - Roots and Radicals - Chapter 9 Test - Page 431: 21

$\approx 22$

Using the properties of radicals, the given expression, $ \sqrt{500} ,$ is approximately \begin{array}{l}\require{cancel} \sqrt{100\cdot5} \\\\= \sqrt{(10)^2\cdot5} \\\\= 10\sqrt{5} \\\\ \approx 22 .\end{array}